public class Test {
    public static void main(String[] args) {
        BinarySearchTree binarySearchTree = new BinarySearchTree();
        int[] arr = {5,12,3,2,11,15};
        for (int i = 0; i < arr.length; i++) {
            binarySearchTree.insert(arr[i]);
        }
        binarySearchTree.insert(13);
        binarySearchTree.remove(12);
        System.out.println("======");
    }
}
